In a large bowl, whisk together the flour, salt, and baking powder. Cut in the butter using a pastry blender or your fingertips until the mixture resembles coarse crumbs. TIP: Work quickly to prevent the butter from melting.
Add the quark, grated cheese, sour cream, and the whole egg. Knead until a dough forms. TIP: If the dough is too sticky, add a little more flour.
Shape the dough into a disc, wrap it in plastic wrap, and refrigerate for 30 minutes.
Preheat the oven to 350°F (180°C) and line a baking sheet with parchment paper.
Roll out the dough to about 1/2 inch (1.5 cm) thickness and cut out scones using a cookie cutter. TIP: Dip the cutter in flour to prevent sticking.
Place the scones on the baking sheet and brush the tops with beaten egg. TIP: The egg wash will give the scones a beautiful glossy finish.
Bake the scones at 350°F (180°C) for 20-25 minutes, or until golden brown. TIP: Keep an eye on the oven to avoid overbaking.
Cool the scones on a wire rack before serving. TIP: They are best served fresh, but will stay delicious the next day if stored in an airtight container.
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